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Students of political systems grapple with a subject matter that is today in constant flux. They must deal not only with the major processes of growth, decay, and breakdown but also with a ceaseless ferment of adaptation and adjustment. The magnitude and variety of the changes that occurred in the world’s political systems beginning in the early 20th century suggest the dimensions of the problem. Great empires disintegrated; nation-states emerged, flourished briefly, and then vanished; world wars twice transformed the international system; new ideologies swept the world and shook established groups from power; all but a few countries experienced at ...(100 of 26666 words)